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| 1 | Fuzzy adaptive robust control for space robot considering the effect of the gravity显示文摘Space robot is assembled and tested in gravity environment, and completes on-orbit service(OOS) in microgravity environment. The kinematic and dynamic characteristic of the robot will change with the variations of gravity in different working condition. Fully considering the change of kinematic and dynamic models caused by the change of gravity environment, a fuzzy adaptive robust control(FARC) strategy which is adaptive to these model variations is put forward for trajectory tracking control of space robot. A fuzzy algorithm is employed to approximate the nonlinear uncertainties in the model, adaptive laws of the parameters are constructed, and the approximation error is compensated by using a robust control algorithm. The stability of the control system is guaranteed based on the Lyapunov theory and the trajectory tracking control simulation is performed. The simulation results are compared with the proportional plus derivative(PD) controller, and the effectiveness to achieve better trajectory tracking performance under different gravity environment without changing the control parameters and the advantage of the proposed controller are verified. | Qin Li Liu Fucai Liang Lihuan Gao Jingfang | 2014 | Chinese Journal of Aeronautics2014，27，6： | 14 |
| 2 | Convergence of the Vlasov-Poisson-Fokker-Planck system to the incompressible Euler equations显示文摘We establish the convergence of the Vlasov-Poisson-Fokker-Planck system to the incompressible Euler equations in this paper. The convergence is rigorously proved on the time interval where the smooth solution to the incompressible Euler equations exists. The proof relies on the compactness argument and the so-called relative-entropy method. | XIAO Ling, LI Fucai & WANG Shu Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100080, China Department of Mathematics, Nanjing University, Nanjing 210093, China College of Applied Sciences, Beijing University of Technology, Beijing 100022, China | 2006 | Science China Mathematics2006，49，2： | 4 |
| 3 | Classification using wavelet packet decomposition and support vector machine for digital modulations显示文摘To make the modulation classification system more suitable for signals in a wide range of signal to noise rate (SNR), a feature extraction method based on signal wavelet packet transform modulus maxima matrix (WPTMMM) and a novel support vector machine fuzzy network (SVMFN) classifier is presented. The WPTMMM feature extraction method has less computational complexity, more stability, and has the preferable advantage of robust with the time parallel moving and white noise. Further, the SVMFN uses a new definition of fuzzy density that incorporates accuracy and uncertainty of the classifiers to improve recognition reliability to classify nine digital modulation types (i.e. 2ASK, 2FSK, 2PSK, 4ASK, 4FSK, 4PSK, 16QAM, MSK, and OQPSK). Computer simulation shows that the proposed scheme has the advantages of high accuracy and reliability (success rates are over 98% when SNR is not lower than 0dB), and it adapts to engineering applications. | Zhao Fucai Hu Yihua Hao Shiqi | 2008 | Journal of Systems Engineering and Electronics2008，19，5： | 4 |
| 4 | Shape control on probability density function in stochastic systems显示文摘A novel strategy of probability density function(PDF) shape control is proposed in stochastic systems. The controller is designed whose parameters are optimally obtained through the improved particle swarm optimization algorithm. The parameters of the controller are viewed as the space position of a particle in particle swarm optimization algorithm and updated continually until the controller makes the PDF of the state variable as close as possible to the expected PDF. The proposed PDF shape control technique is compared with the equivalent linearization technique through simulation experiments. The results show the superiority and the effectiveness of the proposed method. The controller is excellent in making the state PDF follow the expected PDF and has the very small error between the state PDF and the expected PDF, solving the control problem of the PDF shape in stochastic systems effectively. | Lingzhi Wang Fucai Qian Jun Liu | 2014 | Journal of Systems Engineering and Electronics2014，25，1： | 3 |
| 5 | Zero dielectric constant limit to the non-isentropic compressible Euler-Maxwell system显示文摘We investigate the zero dielectric constant limit to the non-isentropic compressible Euler-Maxwell system.We justify this singular limit rigorously in the framework of smooth solutions and obtain the nonisentropic compressible magnetohydrodynamic equations as the dielectric constant tends to zero. | JIANG Song LI FuCai | 2015 | Science China Mathematics2015，58，1： | 3 |
| 6 | Cost of Multicast Logical Key Tree Based on Hierarchical Data Processing显示文摘How to design a multicast key management system with high performance is a hot issue now. This paper will apply the idea of hierarchical data processing to construct a common analytic model based on directed logical key tree and supply two important metrics to this problem: re-keying cost and key storage cost. The paper gives the basic theory to the hierarchical data processing and the analyzing model to multicast key management based on logical key tree. It has been proved that the 4-ray tree has the best performance in using these metrics. The key management problem is also investigated based on user probability model, and gives two evaluating parameters to re-keying and key storage cost. | ZHOU Fucai XU Jian LI Ting | 2006 | Wuhan University Journal of Natural Sciences2006，11，5： | 2 |
| 7 | Analytical algorithm for longitudinal deformation profile of a deep tunnel显示文摘To investigate the longitudinal deformation profile(LDP)of a deep tunnel in non-hydrostatic condition,an analytical model is proposed in our study.In this model,the problem is considered as a superposition of two partial models,and the displacement field of the second partial model is the same as that of the concerned problem.Therefore,the problem can be solved by a model with simple boundary conditions.We obtain the solutions for the stress and displacement fields of an infinite body caused by arbitrary surface tractions on the boundary of the coming tunnel(zone inside the tunnel before excavation)by integrating the extended Kelvin solution over the boundary.The obtained stress solution is used to solve the specific surface tractions,which can satisfy the boundary conditions of the second partial model,on the boundary of the coming tunnel in an infinite body.Then,the specific surface tractions are substituted into the obtained displacement solution to solve the displacement on the wall and face of the tunnel.Therefore,the LDP can also be calculated.The proposed solution is verified by both numerical simulation and the LDP functions recommended by other researchers.The major advantage of our analytical model is that it can consider the effects of the axial and horizontal lateral pressure coefficients.It is revealed that the horizontal lateral pressure coefficient majorly affects the LDP behind the tunnel face,while the axial lateral pressure coefficient dominates the LDP ahead of the tunnel face.Furthermore,the deformation characteristics of the LDPs ahead of the face and the unexcavated core are investigated.The axial displacements of the excavation face can be used to predict the crown displacements ahead of the face. | Qian Fang Gan Wang Fucai Yu Jianming Du | 2021 | Journal of Rock Mechanics and Geotechnical Engineering2021，13，4： | 2 |
| 8 | Optimal mother wavelet-based Lamb wave analyses and damage detection for composite structures显示文摘With the purpose of on-line structural health monitoring,a transducer network was embedded into compos- ite structure to minimize the influence of surroundings.The intrinsic dispersion characteristic of Lamb wave makes the wavelet transform an effective signal processing method for guided waves.To get high precision in feature extrac- tion,an information entropy-based optimal mother wavelet selection approach was proposed,which was used to choose the most appropriate basis function for particular Lamb wave analysis.By using the embedded sensor network and extracting time-of-flight,delamination in the composite laminate was identified and located.The results demon- strate the effectiveness of the proposed methods. | Li Fucai Meng Guang Ye Lin | 2007 | 仪器仪表学报2007，28，10： | 2 |
| 9 | Towards a Dynamic Controller Scheduling-Timing Problem in Software-Defined Networking显示文摘Controller vulnerabilities allow malicious actors to disrupt or hijack the Software-Defined Networking. Traditionally, it is static mappings between the control plane and data plane. Adversaries have plenty of time to exploit the controller's vulnerabilities and launch attacks wisely. We tend to believe that dynamically altering such static mappings is a promising approach to alleviate this issue, since a moving target is difficult to be compromised even by skilled adversaries. It is critical to determine the right time to conduct scheduling and to balance the overhead afforded and the security levels guaranteed. Little previous work has been done to investigate the economical time in dynamic-scheduling controllers. In this paper, we take the first step to both theoretically and experimentally study the scheduling-timing problem in dynamic control plane. We model this problem as a renewal reward process and propose an optimal algorithm in deciding the right time to schedule with the objective of minimizing the long-term loss rate. In our experiments, simulations based on real network attack datasets are conducted and we demonstrate that our proposed algorithm outperforms given scheduling schemes. | Zhenping Lu Fucai Chen Guozhen Cheng Chao Qi Jianjian Ai | 2017 | China Communications2017，14，10： | 2 |
| 10 | Shaping the PDF of the state variable based on piecewise linear control for non-linear stochastic systems显示文摘In this paper, we propose a shape-control scheme for non-linear stochastic dynamical systems to enable us to shape the probability density function(PDF) of the state variable. First, we derive the PDF analytical expression using the Fokker-Planck-Kolmogorov(FPK) equation obtained from stochastic systems.Then, we control the PDF shape by devising a piecewise linear control law whose parameters are calculated using the conjugated gradient method. Finally, we perform contrast simulation experiments to validate the effectiveness and superiority of the proposed algorithm. | Lingzhi WANG Fucai QIAN | 2016 | Science China(Information Sciences)2016，59，11： | 2 |
| 11 | Locally tr-compact rectifiable spaces 显示文摘 | FUCAI L JING Z KEXIU Z | 2015 | Topology Appl2015，193，： | 1 |
| 12 | Complete stati- stical characterization of discrete-time LQG and cumulant control显示文摘 | Qian Fucai Gao Iianjun Li Duan | 2012 | IEEE Transactions on Autom-atic Control2012，57，8： | 1 |
| 13 | Optimized Algorithms for Flexible Length-Based Authenticated Skip List显示文摘With the growing trend toward using cloud storage,the problem of efficiently checking and proving data integrity needs more consideration.Many cryptography and security schemes,such as PDP(Provable Data Possession) and POR(Proofs of Retrievability) were proposed for this problem.Although many efficient schemes for static data have been constructed,only a few dynamic schemes exist,such as DPDP(Dynamic Provable Data Possession).But the DPDP scheme falls short when updates are not proportional to a fixed block size.The FlexList-based Dynamic Provable Data Possession(FlexDPDP) was an optimized scheme for DPDP.However,the update operations(insertion,remove,modification)in Flex DPDP scheme only apply to single node at a time,while multiple consecutive nodes operation is more common in practice.To solve this problem,we propose optimized algorithms for multiple consecutive nodes,which including MultiNodes Insert and Verification,MultiNodes Remove and Verification,MultiNodes Modify and Verification.The cost of our optimized algorithms is also analyzed.For m consecutive nodes,an insertion takes O(m) + O(log N) + O(log m),where N is the number of leaf nodes of FlexList,a remove takes O(log/V),and a modification is the same as the original algorithm.Finally,we compare the optimized algorithms with original FlexList through experiences,and the results show that our scheme has the higher efficiency of time and space. | XU Jian LI Mingjie LI Fuxiang YANG Qingsong ZHOU Fucai | 2016 | China Communications2016，13，1： | 1 |
| 14 | Optimal control of LQG problem with an explicit trade-off between mean and variance显示文摘 | Qian Fucai Xie Guo Liu Ding | 2011 | InternationalJournal of Systems Science2011，42，12： | 1 |
| 15 | Extracting gear fault features using maximal bispectrum显示文摘 | Chen Jin Li Fucai Li Weihua | 2005 | Key Engineering Materials2005，，293294： | 1 |
| 16 | A New Key Exchange Protocol for Threer parties显示文摘 | Yang Xiumei Zhou Fucai Liu Guangwei Chang Guiran | 2009 | Joumal o f Northeastern University( Natural Science)2009，30，7： | 1 |
| 17 | Performance-first con?trol for discrete-time LQG problems显示文摘 | Li Duan Qian Fucai GaoJianjun | 2009 | IEEE Transactions on Automatic Control2009，54，9： | 1 |
| 18 | Variance minimize- ation approach for a class of dual control problems显示文摘 | Li Duan Qian Fucai Fu Peilin | 2002 | IEEE Transactions on Automatic Control2002，47，12： | 1 |
| 19 | Global existence and blow-up for a nonlinear Porous medium equation显示文摘 | LI Fucai XIE Chunhong | 2003 | Applied Mathematics Letters2003，16，： | 1 |
| 20 | High-fidelity numerical realization of multiple-step Fresnel propagation for the reconstruction of digital holograms显示文摘 | Wang Dayong Zhao Jie Zhang Fucai | 2008 | Appl Opt2008，47，： | 1 |
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